%作者 : lws
%时间 : 2021/12/19

%%%%检查正确
syms t s

f1t = exp(-2*t).*heaviside(t);
F1s = laplace(f1t,t,s) 
% F1(s) = 1/(s + 2)

f2t = sin(2*t).*heaviside(t);
F2s = laplace(f2t,t,s) 
% F2(s) = 2/(s^2 + 4)

f3t = dirac(t) + exp(2*t).*heaviside(t) - (4/3)*exp(-t).*heaviside(t);
F3s = laplace(f3t,t,s) 
% F3(s) = 1/(s - 2) - 4/(3*(s + 1)) + 1

